CN2174567Y

CN2174567Y - Shunting straight-pipe type dissipative muffler for fan

Info

Publication number: CN2174567Y
Application number: CN 93231798
Authority: CN
Inventors: 吴宪田; 刘同方; 程洪江; 滕祖松; 田开祥
Original assignee: WEIFANG LIDA FAN FACTORY
Current assignee: WEIFANG LIDA FAN FACTORY
Priority date: 1993-09-07
Filing date: 1993-09-07
Publication date: 1994-08-17
Anticipated expiration: 2003-09-07

Abstract

The utility model relates to a muffler device for a fan, which is mainly composed of a vent tube, sound absorption poles arranged inside and outside the vent tube, and a sound absorption jacket. The utility model overcomes the ubiquitous shortcomings, such as small muffling amount, great pressure loss, high regenerated noise of the air-stream, etc. in the fan muffler used presently. The utility model has the advantages of wide muffling frequency band, big muffling amount, low regenerated noise, good muffling effect, long service life, etc. The insertion loss is greater than 23-30 dB (A). When the gas flow is less than 15 m/s, the regenerated noise is not greater than 40 dB (A).

Description

Shunting straight-pipe type dissipative muffler for fan

The utility model relates to a kind of blower fan silencer.

The present blower fan silencing apparatus that uses, main by square cabinet shell and be located at its inner anechoic sheet and form, anechoic sheet is layered arrangement in housing, acoustically effective is poor during use: sound deadening capacity is little, the pressure loss is big, air-flow regenerated noise height, during less than 15m/s, regenerated noise can reach 70dB(A at gas flow rate); Gas is by behind the silencing apparatus, and the flow velocity inequality is vibrated greatly, and service life of equipment is short.

The purpose of this utility model is that a kind of fan noise of can not only eliminating preferably of design pollutes, and the silencer of long service life.

The utility model comprises ventilation duct and is located at its inner sound absorber, ventilation duct is provided with the sound absorption cover outward, the ventilation duct perisporium is provided with the sieve aperture that communicates with the cover that absorbs sound, sound absorber in the ventilation duct is circular sound absorption post, circular sound absorption post is vertically arranged in ventilation duct, and joins by splitter and draught tube walls.

Be equipped with sound absorber inside and outside the utility model ventilation duct, interior sound absorber is circular sound absorption post, and after air communication was crossed silencing apparatus, flow velocity was even, vibrate little, sound deadening capacity is big, under the similarity condition, improves 10dB(A than using former silencing apparatus to insert loss), regenerated noise reduces 30dB(A), the pressure loss is little, has not only reduced noise pollution effectively, and has prolonged service life of equipment.

Below in conjunction with drawings and Examples the utility model is further described.

Accompanying drawing has provided embodiment of the present utility model, wherein:

Fig. 1 is the utility model part cut-away view;

Fig. 2 is the utility model vertical profile diagrammatic sketch;

Fig. 3 is the cross-sectional diagrammatic sketch of the utility model.

The utility model comprises ventilation duct (2) and is located at its inner sound absorber, ventilation duct is provided with sound absorption cover (9) outward, sound absorption cover (9) is made up of housing (1) that is connected as a single entity with ventilation duct (2) wall and the sound-absorbing material (3) that is filled in wherein, ventilation duct (2) perisporium is provided with the sieve aperture (7) that communicates with the cover (9) that absorbs sound, sound absorber in the ventilation duct (2) is circular sound absorption post (8), circular sound absorption post (8) by pipe (4) and the sound-absorbing material (3) in being filled in form, pipe (4) perisporium is provided with sieve aperture (7), circular sound absorption post (8) is vertically arranged in pipe, and join by splitter (5) and ventilation duct (2) wall, splitter (5) has 3 and be spoke shpae and arrange at least, and (6) are air-flow path among the figure.

Claims

1, the resistive blower fan silencing apparatus of a kind of shunting straighttube-type, comprise ventilation duct (2) and be located at its inner sound absorber, it is characterized in that the outer sound absorption cover (9) that is provided with of ventilation duct (2), ventilation duct (2) perisporium is provided with the sieve aperture (7) that communicates with the cover (9) that absorbs sound, sound absorber in the ventilation duct (2) is circular sound absorption post (8), and circular sound absorption post (8) is vertically arranged in pipe and joined by splitter (5) and ventilation duct (2) wall.

2, according to the resistive blower fan silencing apparatus of the described shunting straighttube-type of claim 1, it is characterized in that described sound absorption cover (9), form by housing (1) that is connected as a single entity with ventilation duct (2) wall and the sound-absorbing material (3) that is filled in wherein.

3, according to the resistive blower fan silencing apparatus of the described shunting straighttube-type of claim 1, it is characterized in that described circular sound absorption post (3) by pipe (4) and be filled in inner sound-absorbing material (3) and form, pipe (4) perisporium is provided with sieve aperture (7).

4,, it is characterized in that described splitter (5) has 3 and be spoke shpae and arrange at least according to the resistive blower fan silencing apparatus of the described shunting straighttube-type of claim 1.